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Ammonia Volatilization Losses from Urea Applied to Wheat on a Paddy Soil in Taihu Region, ChinaEnglish Full Text

FAN Xiao-Hui, SONG Yong-Sheng, LIN De-Xi, YANG Lin-Zhang and ZHOU Jian-MinInstitute of Soil Science, Chinese Academy of Sciences, Nanjing 210008 (China).

Abstract: Ammonia volatilization losses from urea applied as a basal fertilizer and a top dressing at tillering stage in a wheat field of Taihu Region, China, were measured with a micrometeorological technique. Urea as fertilizer was surface broadcast at 81 (low N) and 135 (high N) kg N ha-1 as basal at the 3-leaf stage of the wheat seedling on December 2002, and 54 (low N) and 90 (high N) kg N ha-1 as top dressing on February 2003. Ammonia volatilization losses occurred mainly in the first week after applying N fertilizer and mainly during the period after basal fertilizer application, which accounted for more than 80% of the total ammonia volatilization over the entire wheat growth period. Regression analysis showed that ammonia volatilization was affected mainly by pH and NH4+-N concentration of the surface soil and air temperature. Ammonia volatilization flux was significantly correlated with pH and NH4+-N concentration of the surface soil and with daily air average temperature and highest temperature. Thus, application of urea N fertilizer to wheat should consider the characteristics of ammonia volatilization in different periods of N application so as to reduce ammonia losses.
  • Series:

    (D) Agriculture

  • Subject:

    Crop

  • Classification Code:

    S512.1

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